Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdcabaaefbb908f…

MALICIOUS

PDF

86.7 KB Created: 2021-07-01 17:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33801547a8a20fa67c4bd00f0d9612ff SHA-1: 503a4f116146ad0c8140b3c2c12b9e0f137f4c72 SHA-256: 9cdcabaaefbb908f7ffa1a82e7a9b3a0b89015138e0e5c151470c92ff613fdfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and heuristic firings indicate malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://arunimaflavours.com/userfiles/file/2406172819.pdf
    • http://coreaad.com/DreamDataUpload/file/sivozapujiduvabalelisipa.pdf
    • https://acryl-bg.com/userfiles/file/jatugojedibupoze.pdf
    • http://backupcenters.com/userfiles/file/magavoralulizir.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b092a1916c---pirejozimepegod.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/c6f520a32a20f44d5de941095c017351/38579628770.pdf
    • https://m-astar.com/UserFiles/files/24733343171.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/dea5155455d14d9077797c755987e37e/39530057136.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee685834d7---sigufitexekuteladad.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/23d898daafff738605903c326d2cecd6/tijupasefeguwavapugif.pdf
    • http://pphu-joanna.pl/fckpliki/file/12633493060.pdf
    • http://www.ecostroyservis.ru/File/zawemovakabo.pdf
    • http://www.look4job.gr/images/_user_na/file/tufemix.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e428c6cc---tolexesokofew.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/i26rrua75teqd41hm3jv6vuaol/75233805889.pdf
    • http://romanakladatelstvi.cz/userfiles/file/18856297929.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bebe5107---37699256014.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0f7f7c7d290a0cdc2d32017b8cdafc5a/josividizitimajifav.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf763c962ec---gobasoxilodu.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082cd9020b1b---7223484950.pdf
    • http://brandnewgoods.net/userfiles/file/17704288131.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/nt2897gqm9okicbmkgguk9r0m9/nolak.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/froa0btcc1jbogktb697cgo3u6/waligebanub.pdf
    • https://pelletier-tp.fr/ckfinder/userfiles/files/wugumogogagonus.pdf
    • http://thegioituigiay.net/uploads/files/jovadijirupaxedudovibotap.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073b2aea2647---84121816740.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=create+one+pdf+file+from+multiple+pdf+files
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eab5.bin
7f09759e8adac738e780833981fe8fce3701d7b2227a4ef32027fd6a3d86184d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 10788 bytes
font_01_sfnt_off00010387.bin
0bcb59c42ded629e482da0df1805caf6bd03897283faa9ede34cd11f0c8b6a36
pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 17968 bytes
font_02_sfnt_off00013321.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13321 16792 bytes